6Manaster J. The Pecan Tree [ M ] . Austin: University of Texas Press, 1994.
7Rice G W. Pecans Growerps Perspective [ M]. Ponca City: PecanQuest Publications, 1994.
8Thomson T E,R E Hunter, G D Madden,et al. Performance of varieties and selection in a high density orchard establishment test [J]. Pecan Quart. 1981,15:14-19.
9L J Grauke, Thomson T E. Pecans and hickories[ A]. J ulesJanick, James N Moore. Fruit Breeding Vol 3: Nuts [ C]. John Wiley &Sons, Inc. 1996:185-202.
10Brison F R. Pecan Onlture [ M ]. Austin : Capital Printing Co, 1974.
